sdf-parser/lib/normaliseChunk.js

SDF parser

/**
 * Normalise CRLF sequences in `chunk` to LF. Lone `\r` (old Mac OS 9 line
 * endings, pre-2001) is not supported and passes through unchanged.
 *
 * A `\r` at the very end of a chunk is held in `state.pendingCR` so that a
 * `\r\n` pair split across a chunk boundary is still collapsed to a single
 * `\n`.
 * @param chunk - The incoming text chunk to normalise.
 * @param state - Mutable state shared between chunk invocations.
 * @param state.pendingCR - Whether a `\r` was held over from the previous chunk.
 * @returns The chunk with CRLF sequences replaced by LF.
 */
export function normaliseChunk(chunk, state) {
    let text = chunk;
    let prefix = '';
    if (state.pendingCR) {
        state.pendingCR = false;
        if (text.startsWith('\n')) {
            prefix = '\n';
            text = text.slice(1);
        }
        else {
            prefix = '\r';
        }
    }
    if (text.endsWith('\r')) {
        state.pendingCR = true;
        text = text.slice(0, -1);
    }
    return prefix + text.replaceAll('\r\n', '\n');
}
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